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@(#)setpgid.2 8.1 (Berkeley) 6/4/93
$FreeBSD$
.Dd February 8, 2004 .Dt SETPGID 2 .Os .Sh NAME .Nm setpgid , .Nm setpgrp .Nd set process group .Sh LIBRARY .Lb libc .Sh SYNOPSIS n unistd.h .Ft int .Fn setpgid "pid_t pid" "pid_t pgrp" .Ft int .Fn setpgrp "pid_t pid" "pid_t pgrp" .Sh DESCRIPTION The .Fn setpgid system call sets the process group of the specified process .Fa pid to the specified .Fa pgrp . If .Fa pid is zero, then the call applies to the current process. If .Fa pgrp is zero, then the process id of the process specified by .Fa pid is used instead.
p If the affected process is not the invoking process, then it must be a child of the invoking process, it must not have performed an .Xr exec 3 operation, and both processes must be in the same session. The requested process group ID must already exist in the session of the caller, or it must be equal to the target process ID. .Sh RETURN VALUES .Rv -std setpgid .Sh COMPATIBILITY The .Fn setpgrp system call is identical to .Fn setpgid , and is retained for calling convention compatibility with historical versions of x . .Sh ERRORS The .Fn setpgid system call will fail and the process group will not be altered if: l -tag -width Er t Bq Er EINVAL The requested process group ID is not legal. t Bq Er ESRCH The requested process does not exist. t Bq Er ESRCH The target process is not the calling process or a child of the calling process. t Bq Er EACCES The requested process is a child of the calling process, but it has performed an .Xr exec 3 operation. t Bq Er EPERM The target process is a session leader. t Bq Er EPERM The requested process group ID is not in the session of the caller, and it is not equal to the process ID of the target process. .El .Sh SEE ALSO .Xr getpgrp 2 .Sh STANDARDS The .Fn setpgid system call is expected to conform to .St -p1003.1-90 .